My son is 6 years old, weight 70-75. He used to wear a medium size (and they still fit) but he needed more pairs so we just ordered a large size and he loves it! They fit comfortably anywhere but are long and hit the knees which my son doesn't mind which is perfect as we bought longer panties to prevent chafing.
π Russell Athletic FreshForce Protection: Boost Your Boys' Performance with Assorted Clothing
49 Review
π Brix Boys Long Sleeve Tees - Optimized Clothing for Boys
42 Review
Comfortable & Durable: Lucky & Me Noah π©² Boys Boxer Shorts 5 Pack - 100% Cotton Tagless Underwear
49 Review
Comfortable & Practical City Threads Underwear: Sensitive-Friendly Boys' Clothing
47 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review